30
YT-3400/3450 series
6.2
A/M switch adjustment
1. On the left hand bottom of positioner, there is A/M switch (Auto/Manual). If the switch is
turned clockwise
(toward “A”) and it is fasten tightly, then the supply pressure will be
transferred to actuator through outport by positioner control. On the other hand, if the
switch is turned counter-
clockwise (toward “M”), it is loosened, then the supply pressure
will be directly supplied to the actuator regardless of positioner control. It is extremely
important to check the pressure level when the switch is loosened
2. Check whether the supply pressure is too high.
3.
After using “Manual” fuction, A/M switch should be returned to “Auto”
Fig. 38:
A/M switch adjustment
6.3
Variable Orifice Adjustment
Hunting can be occurred when the actuator
’s volume is too small. In order to prevent
hunting, orifice can be adjusted. By adjusting the orifice, the flow rate of the supply
pressure to actuator can be adjusted. Please use (-) driver to adjust the orifice. When slot
(-) of the orifice is horizontal, the flow rate becomes maximum. When slot (-) of the orifice is
vertical, the flow rate becomes minimum.
Fig. 39:
Variable orifice adjustment
